Table 1.

Patient characteristics by BMI (N=702,456)

Characteristic	BMI (kg/m2)						P Value
	<18.5	18.5–24.9	25–29.9	30–34.9	35–39.9	≥40
Patients (n)	54,398	222,237	194,436	116,968	60,700	53,717
Age (yr), mean±SD	61±19	64±17	63±15	61±14	59±14	57±13	<0.001
Men	49	58	58	51	56	63	<0.001
Race							<0.001
White	62	66	67	65	62	59
Black	31	26	28	30	34	37
Other	7	8	5	5	4	4
Inability to ambulate	6	5	4	4	5	7	<0.001
Insurance							<0.001
Medicare/Medicaid	85	82	81	79	78	78
Private	2	4	5	6	7	8
Other	3	6	6	7	7	6
No insurance	10	8	8	8	8	8
Cause of ESRD							<0.001
Diabetes	32	36	47	55	60	60
Hypertension	33	32	26	22	19	19
Glomerular	10	9	9	8	8	9
Polycystic disease	2	3	3	2	2	2
Other	23	20	15	13	11	10
History of comorbid conditions
Ischemic heart disease	21	24	25	24	23	20	<0.001
Cerebrovascular disease	10	10	9	9	8	7	<0.001
Congestive heart failure	30	31	32	34	35	37	<0.001
Peripheral vascular disease	15	15	14	14	14	13	<0.001
Cancer	6	7	6	5	5	4	<0.001
Year of first ESRD treatment							<0.001
1995–1999	60	34	29	25	23	20
2000–2003	22	35	36	36	35	35
2004–2007	18	31	35	39	42	45
RUCA group							<0.001
Metropolitan	80	81	80	78	77	77
Micropolitan	10	11	10	12	12	12
Rural	10	9	10	11	11	11

Data are given in percentages unless otherwise indicated. The frequency of missing data was as follows: data on age, race, cause of ESRD, ambulatory status, and comorbid conditions were missing in <1%; data on insurance were missing in 2%. BMI, body mass index; RUCA, rural urban commuting area codes.